Screen bar for crushing machinery



, April 12, 1927. 1,624,886 V G. w. BORTON SCREEN BAR FOR CRUSHING MACHINERY Filed Dec. 15, 1926 Patented A r. 12, 19,27. 1,624,886

NITED STATE v PATEN OFFICE.

ononer. w. isonron, or rnrtanntrnra, rnnnsrnvanmjassmnon' .ro PENNSYL- vma enusmm COMPANY, or NEW YORK, N. Y., A COEPOBATION or new YORK.

SQBEEN BAR ron. enusnme maenmnmz. Application filed Deeember 15, 1926. Serial No.,154,916.

My invention relates to crushing machinpivotally mounted at 2, and providing ery employed in reducing coal, ore, stone, grooves 3, forming seats for the reception and. the like, more particularly those familof the ends of bars '4, which make up the iarly known as hammer crushers, and one grid or grate constituting the cage, and

5 object of my invention is to provide an imagainst which the crushing or breaking proved form of screen bar employed 1n actiontakes place under the action of ham- Y making up the-discharge gridjor grate of mers 5.

- structures of this type; or grate These hammers may be pivotally mounted being disposed substantial -concentricwith von rods 6, carried by .disks 7, supported'by respect to the path of the ammer members a shaft v8, and constitute the rotor element of which effect the breaking or crushing of the the crushing machine. The frame or cage 1,

material operated upon by beating it againstcarrying thebars 4, is pivotally mounted in the edges of the bars making up such grld the usual manner so as to permit adjustment or grate. of the grate orgrid formed by said bars 4,

A further object of my invention is to prowith respect to the path of the hammers.

vide a self-spacing bar; such spacing means A bar of the preferred construction is 7 being formed integral with the bar or not, shown in Fig. 2, and comprises a section of as may be desired. steel, of material length, rectangular or sub And a still further object of my invenstantially' so in. cross section, having pro- 20 tion is. to provide a reversible bar havlng jections 4 ,.which may be integral with the spacing means which will be disposed in body of the bar; such projections being dis- 7 substantially thesame relation no matter posed inwardly a slight distance with rewhat the position of the bar may be in the spect to the active edges of the bars. The seats provided for the ends of the same; projections 4 are preferably beveled intWo 25 such seats being in the form of semicircular directions with respect to the side faces of grooves in a frame or cage which may be the bars so that when disposed in proper pivotally mounted in the side walls of the relation to the rotor element to form the crushing structure. screen or grate of the crushing structure, one 7 These and other features of my invention of the inwardly disposed surfaces 4", of 30 are more fully described hereinafter; refereach of such projections will be in contact ence being had to the accompanying drawthroughout its entire area with the near face ings, in.which: j of an adjacent bar, and such contacting Figure 1, is a cross sectional elevation, surfaces 4 will lie'in planes substantiall more-or less diagrammatic, of one form of parallel to radial lines passing through ad 35 crushing machinery in which my improved jacent contacting bars.

screen bar maybe employed. By preference. one face only of each of Fig. 2, is a perspective view of one of the the bars is provided with these spacing, proscreen bars shown in Fig.1. jcctions, and the extent theirlateral projec- Fig. 3, is an end view of another form of tion with respect to said bars determines the 4 screen bar. distance between the several bars in the for- Figs; 4 and 5, are sectional views illusmation of the cage or screen; which distance trating other forms of screen bars within may differ for different material undergoing "the scope of my invention. and crushing. In the preferred construction of Figs. 6, 7, '8 and 9, are diagrammatic my improved screen bars, these spacing proviews illustrating the position of my imjections are integral, as shown in Figs. 2, 6 proved bars in use; such views showing 7, et seq. i clearly their availability for reversal to in- I may, however, provide these spacing crease their wearing life. projections upon both sides of the bars. as The improved screen bar forming the subshown in Fig. 3, and in either instance they ject of my invention is particularly availmay be separate pieces suitably secured to able for use with hammer .erushers, and in the bars; Figs. 4 and 5, showing construc- 1 Fig. 1, I have illustrated, moreor less diations within the scope of my invention, in grammatically, a crushing machine of. this which the spacing pro ections are separate type, having the usual cage or frame 1, pieces, indicated at 14, and are secured to ing these bars iectangular in cross section it is possible to utilize all four edges for crush mg effect as they are successively worn; the

' bars being capable of reversal as well as being turned end for end. In Figs. 6, 7, 8 and 9, It have illustrated, diagrammatically, the manner of using my improved bar so that full advantages may be taken of its reversibility in order that increased wear may be secured before replacement. Fig. 6, shows a set of bars in the first position before any wear occurs; Fig. 7, shows the position of bars after being turned end for end, with the edge opposite the worn edge in service; Fig. 8, shows the bars reversed, with the two worn edges at the outer peripheral margin of the grid or grate, and Fig. 9, shows the bars in the last position of use before renewal becomes necessary.

7 In all instances, the rejections are beveled in the manner indicated; the beveled surfaces being tangent to the plane of the side walls of the bars, with the contacting portions of such projections lying in planes substantially parallel with radial lines passing through adjacent bars of the semi-cirgrate or screen from the axis of rotain crosssection havin a luralit ofs acin a 2-1 P V lugs disposed inwardly with respect to the edge of the bar and projecting at right angles with respect to the longitudinal axis of the bar; each lug being provided with flat contacting faces disposed each at an angle to the other.

2. A screen bar rectangular in cross section, having a plurality of integral spacing lugs disposed on one side of said bar and set inwardly with respect to the edges of the bar; each lug being provided with flat contacting faces disposed each at an angle to the other.

3. A. screen bar rectangular in cross section, having a plurality of spacing lug projecting at right angles from a broad surface of the same and positioned inwardly with respect to the marginal edges of said bars, and each of said spacing lugs having a plurality of outwardly beveled bearing surfaces meeting in a plane intermediate the Working edges of the bar whereby flat contacting faces disposed at an angle to each other are provided.

In witness whereof I have signed this specification.

GEORGE W. BURTON. 

